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G. W. KING & H. J. BA'RNHART.

FRICTION CLUTCH.

No. 558,691. Patented Apr. 21, 1896. v

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GEORGE 7. KING AND HARRY J. BARNIIART, OF MARION, OHIO, ASSIGNORS TO THE MARION STEAM SllOVEL COMPANY, OF SAME PLACE.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 558,691, dated April 21, 1896.

Application filed May 7,1895. erial No. 548,382. (No model.)

T at whom it may concern: a; but said brake-wheelrotatcs with the shaft,

Be it known that we, GEORGE WV. KIN G and as will hereinafter appear.

HARRY J. BARNHART, of Marion, in the county D and E designate a pair of toggle-arms of Marion and State of Ohio, have invented that are preferably arranged about midway 55 certain new and useful Improvements in Friebetween the peripheries of brake'wheel C and tion-Clutches; and we do hereby declare the driving-wl1eel a. The outer end of togglefollowing to bea full, clear, and exact descriparm E is pivoted, as at c, to wheel a, and the tion of the invention, such as will enable othouter end of the other toggle-arm D is operaers skilled in the art to which it pertains to tively connected with the outer end of an 60 make and use the same. arm or lever G, operatively mounted upon a Our invention relates to improvements in rock-shaft H, that is shown journaled in the friction-clutches designedforestablishing oprim of wheel a. Rock-shaft H is provided erative connection between a rotating shaft with another arm or lever l, to the outer end and a drum, wheel, or rotatable body loosely of which is suitably attached brake strap 65 I 5 mounted on the shaft. or band K, that is adapted to frictionally en- Of all the friction-clutches heretofore degage the annular rim or friction-surface Z), vised the strap or brake-band type presents with which drum or rotatable body B is prothe simplest form; but the great difficulty vided. The other end of brakestrap K is heretofore encountered in applying power to shown attached to gear or wheel a at K, Fig. 1. 7o

tighten the strap or band has prevented gen- Togglearms D and E, preferably near their era-l use of this type of friction-clutches. joint or connection with each other, are op- WVe have devised an improved frictioneratively connected by means of a link L clutch of the type referredto, wherein. we utilwith brake-wheel C, and the peripheral surize the power that drives the machinery to face of the latter is engaged by a brake-band 75 tighten the strap or brake-band by means of M, that at one end is shown attached to any a simple system of connecting rods and levers relatively stationary object, and at its other and a small brake-wheel manipulated by a end is operatively connected with a handbrake-band and hand-lever; and our invenlever O, that is fulcrumed, as at O, to any tion consists in certain features of construcsuitable support. 80 0 tion and in combinations of parts hereinafter R represents a spring that acts 1n the didescribed, and pointed out in the claims. rection to move the toggle-arms outwardly In the accompanying drawings we have from a straightened position, said spring be shown a preferable construction of friotioning preferably a coil-spring confined upon a clutch embodying our invention. rod S, that at one end is pivoted to one of the 8 5 3 5 Figures 1 and 2 are elevations taken at right toggle arms, as at S, and extends easily angles to each other, portions being broken through a hole in a lug a, located on one of away, and in section in Fig. 2 to more clearly the arms of gear a, between the toggle-arms show the construction. and hub of said gear, and a stop T to prevent Referring to the drawings, A designates a the togglearms from moving inwardly be- 0 4o rotating shaft and a the driving gear or wheel yond a straightened position is provided, said operatively mounted upon said shaft, and stop being preferably adjustable toward and which, we will suppose, is driven in the difrom the toggle-arms and consisting preferrection indicated by the arrow. ably of a bolt or screw engaging a correspond- B represents a drum, pulley, or rotatable ingly-threaded hole in the aforesaid lug a.

body loosely mounted upon the shaft at one Bythe construction hereinbefore described end of the hub of gear a, and between which it will be observed that as brake-wheel A rorotatable body and the shaft it is desired to tates with the shaft, spring R and centrifugal establish and interrupt operative connection, force cause togglearms D and E to move outas occasion may require. wardly in the direction of the periphery of I00 A brake-wheel O is loosely mounted upon wheel a, and thereby, through the interven the shaft A at the other end of the hub of gear tion of rock-shaft I l and arms or levers G and I, loosen brake-strap K, and it will further be observed that the elasticity of brake-strap K will assist in said loosening operation. Spring R might be dispensed with, as the centrifugal force together with the assistance of the elasticity of the brake-strap would be sufficient; but the spring is a valuable addition because it maintains the parts in a desirable posit-ion when the machinery is not in motion, and it also assists in lifting or moving outwardly toggle-arms D and E when said arms are approximately in a straight line. It will be observed that toggle-arms D and E exert their greatest force on brake-strap K when they are in line or approximately in line; but when hand-lever O is actuated in the direction of the operator, brake-band M will be tightened upon brake-wheel O, causing said wheel to stop or slaeken its speed while the other parts rotate or revolve with the shaft, whereby through the intervention of connecting-rod L toggle-arms D and E are actuated inwardly toward the shaft, causing arm or lever G, together with rock-shaft II and arm or lever I, to move in the direction required to tighten strap or band K. Stop T, as already indicated, prevents toggle-arms D and E from being actuated inwardly beyond a straight line or slightly beyond a straight line when they are desired to assist in locking the clutch. Said togglearms may, however, be moved as nearly into a straightened position as will produce the best results.

It is obvious that by the construction hereinbefore described a very small amount of power applied to lever 0 will apply the clutch, because the power of the driving machinery is utilized in the application of the clutch.

hat we claim is 1. The combination of a rotating shaft, drum or rotating body loosely mounted upon said shaft and provided with a friction-surface, drivin g-wheel operati vel y mounted upon the shaft, band or strap K adapted to frietionally engage the aforesaid friction-surface, one end of said strap being suitably attached to the driving-wheel, toggle-arms D and E, rock-shaft H with its arms or levers G and I, said arms, rocleshaft and levers being borne by the driving-wheel and lever I being operatively connected with the other end of the aforesaid strap or band, brake-wheel O loose upon the shaft, said brake-wheel being opera-tively connected with the toggle-arms, band M adapted to frictionally engage the brakewheel and means for applying said band, all arranged and operating substantially as shown, for the purpose specified.

2. The combination of a rotating shaft, drum or rotating body loosely mounted upon said shaft and provided with a friction-sun face, driving-wheel operatively mounted upon the shaft, band or strap adapted to frictionally engage the aforesaid friction-surface, one end of said strap being suitably attached to the driving-wheel, toggle-arms D and E arranged and supported substantially as indicated, mechanism operatively connecting the other end of the aforesaid strap or band with the toggle-arms, brake-wheel C loose upon the shaft and operatively connected with the togglearms, band M adapted to frictionally engage the brake-wheel and means for applying said band,and a suitably-supported spring acting to move the toggle-arms outwardly, all arranged and operating substantially as shown, for the purpose specified.

3. The combination of a rotating shaft, drum or rotating body loosely mounted upon said shaft and provided with a friction-surface,driving-wheel operatively mounted upon the shaft, band or strap adapted to frictionally engage the aforesaid friction-surface, one end of said strap being suitably attached to the driving-wheel, toggle-arms D and E arranged and supported substantially as indicated, mechanism operatively connecting the other end of the aforesaid strap or band with the toggle-arms, brake-wheel C loose upon the shaft and operatively connected with the toggle-arms, band M adapted to frictionally engage the brake-wheel and means for applying said band, and a stop for limiting the inward movement of the toggle-arms, substantially as shown, for the purpose specified.

4. The combination of a rotating shaft, drum or rotating body loosely mounted upon said shaft and provided with a friction-surface, driving-wheel operatively mounted upon the shaft, band or strap adapted to frictionally engage the aforesaid friction-surface, one end of said strap being suitably attached to the driving-wheel, toggle-arms D and E arranged and supported substantially as indicated, mechanism operatively connecting the other end of the aforesaid strap or band with the toggle-arms, brake-wheel O loose upon the shaft and operatively connected with the toggle-arms, band M adapted to frictionally engage the brake-wheel and means for applying said band, and a stop for limiting the inward movement of the toggle-arms, substantially as shown and described.

In testimony whereof we sign this specification in the presence of two witnesses.

GEORGE \V. KING. HARRY J. BARNIIART. liitnesses EDW. E. EBBER, ll. 0. \VINsLow. 

